Spotted seahorse

Lore & Background

The spotted seahorse can reach a length of 17–30 cm. Its body is large, elongated, and lacks spines, with all bumps rounded. The head is relatively large, the snout short and thick, and the coronet small and rising toward the rear, sometimes with filaments. Body coloration is often dark with a grainy texture, but can also be yellow, cream, or reddish with blotches and numerous small dark spots. Some adults have a black line across the dorsal fin. The tail is used as a grasping appendage, bending ventrally due to body plates and hypoxia muscles. Hippocampus kuda ranges from the Persian Gulf to Southeast Asia, Australia, Japan, and several Pacific islands including Hawaii, and also along the eastern coast of Africa from Tanzania to South Africa. It inhabits estuaries, lagoons, harbors, littoral zones, and coastal seagrass beds in shallow waters up to fifty-five meters deep. The majority of the population occurs from the Chinese coast down to Australia. The species is completely monogamous. Courtship involves the male changing color patterns, dancing around the female, and producing a clicking sound with the coronet. After tails intertwine, the female places up to one thousand eggs into the male's ventral brood pouch via an ovipositor. Development lasts twenty to twenty-eight days, with birth depending on monsoon patterns, lunar cycles, and water temperature. Males typically give birth during a full moon, and newborns average seven millimeters in length. H. kuda are omnivores that feed on minuscule living prey such as larval fishes and zooplankton via suction feeding. They are not strong swimmers. Predators include crabs, rays, tuna, sea turtles, and humans.

Reader's Guide

The spotted seahorse is a small, poor-swimming fish that uses its prehensile tail to anchor to coral reefs and branches. In the wild, it inhabits shallow coastal waters, estuaries, and seagrass beds. Its diet consists of tiny living prey like larval fishes and zooplankton, which it captures by suction feeding. The species is monogamous, with males brooding up to one thousand eggs in a ventral pouch for twenty to twenty-eight days, with births often coinciding with the full moon. In the aquarium trade, Hippocampus kuda is popular but requires specialized care. It has a very small mouth and eats only small animals such as brine shrimp and newborn guppies, needing to be fed four to five times daily. Many aquarists cultivate their own brine shrimp and rotifers; daphnia is eaten when other foods are unavailable. Seahorses need anchor points like coral or branches because they are poor swimmers. They prefer a quiet tank without large, belligerent fish and a slow-moving current. Acceptable tankmates include Synchiropus splendidus and other bottom-dwelling fishes. Optimal temperature is 72–77 °F (22–25 °C), with an ideal pH of 8.1–8.4 and salinity around 32 ppt, though they can tolerate 18–36 ppt. The species is classified as vulnerable by the IUCN due to bycatch, targeted catch for the aquarium and traditional medicine trade, and habitat destruction. It is listed in Appendix II of CITES, meaning trade must be controlled.

Did You Know?

• The male spotted seahorse carries up to one thousand eggs in a ventral brood pouch.
• Males typically give birth during a full moon, with newborns averaging seven millimeters in length.
• The species is completely monogamous and engages in a courtship ritual involving color changes and clicking sounds.
• 25 million seahorses are used every year for traditional Chinese medicine.